TY  - BOOK
AU  - Filchner Wilhelm
AU  - Hagen Toni
AU  - Przybyllok Erich
TI  - Route-mapping and position-locating in unexplored regions
U1  - 526.9 
PY  - 1957///
CY  - New York
PB  - Academic Press
KW  - Mapping
KW  - Route
KW  - Surveying
ER  -